28327391 has 2 divisors, whose sum is σ = 28327392. Its totient is φ = 28327390.

The previous prime is 28327361. The next prime is 28327393. The reversal of 28327391 is 19372382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28327391 is a prime.

It is a Sophie Germain prime.

Together with 28327393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28327393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14163695 + 14163696.

It is an arithmetic number, because the mean of its divisors is an integer number (14163696).

Almost surely, 2^28327391 is an apocalyptic number.

28327391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28327391 is an equidigital number, since it uses as much as digits as its factorization.

28327391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 28327391 is about 5322.3482599319. The cubic root of 28327391 is about 304.8378283260.

The spelling of 28327391 in words is "twenty-eight million, three hundred twenty-seven thousand, three hundred ninety-one".